Frequency Tuning Range Expansion for the Millimeter-Wave Band Tunable Filter

For the realization of the smart community, the Internet of Things IoT and sensor technology in the millimeter-wave band is necessary. The development of these technologies requires accurate spectrum analysis in the frequency domain over 100 GHz. A tunable preselection filter is a key device in building such a spectrum analyzer. In this paper, we propose use of a ridge waveguide to achieve frequency tuning over a wider bandwidth. In addition, we demonstrate an example design and prototype for a filter with a relative bandwidth of 38% 75 GHz to 110 GHz and 32% 78.1 GHz to 107.5 GHz, respectively.

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